[Rivet]

Occationally my Sram XO rear D likes to shift itself from gear to gear on its own.

What can I do about this to stop it? I can reduce the frequency of occurance by dittling the adjustment knob on my XO shifters but it doesn't completly stop the problem.

Any insight would be appreciated!

Thx!

If the derailluer is adjusted correctly it's probably a bent hanger. Seems to work fine then inexplicably ghost shift? Bent Hanger.

 

[MTBNate]

Occationally my Sram XO rear D likes to shift itself from gear to gear on its own.

What can I do about this to stop it? I can reduce the frequency of occurance by dittling the adjustment knob on my XO shifters but it doesn't completly stop the problem.

Any insight would be appreciated!

Thx!

 

[bigwheelboy_490]

I'd suggest looking at your housing to make sure its long enough. Short housing with a variable rear end might be causing the problem. And I agree with Rivot about checking your derailleur alignment.

Also, any broken rollers on the chain?

 

[Geo Dude]

Yup...

bent hanger gets my vote. Did you lay that re-modled Rx down lately?

 

[29inch]

Occationally my Sram XO rear D likes to shift itself from gear to gear on its own.

What can I do about this to stop it? I can reduce the frequency of occurance by dittling the adjustment knob on my XO shifters but it doesn't completly stop the problem.

Any insight would be appreciated!

Thx!

I wouldn't jump straight to bent hanger.

I would just straight to "needs slight adjustment"...especially if it hasn't been adjusted since you put the XO's (with new cables presumably) on there this past fall.

Where does the ghost shift occur? When climbing, smooths, etc? Does it skip down to a lower cog, or up to a higher cog? Does it act like it's going to jump a little before it does, then if finally gives up the ghost (sorry, couldn't resist)? Does it tend to occur on the lower, middle, or top part of the cogset? Does it occur more when you're in the small, middle, or large chainring up front??

Answering all of these, we might be able to disagnos how you need to adjust your derailer. But 99.9999% probability your cable has just stretched a little and settled in, just needs a 1/2 turn tightening on the derailer, and all ills will be forgiven.

 

[NoMud]

Looking at the pics you posted here (http://forums.mtbr.com/showthread.php?t=151570 ), I'd suggest the cableing linking your mainframe and rear triangle is too short. Titus frames need a bit of a 'loop', like this to avoid ghostshifting.

 

[NoMud]

Oops, excuse the stupid pic!

 

[MTBNate]

I wouldn't jump straight to bent hanger.

I would just straight to "needs slight adjustment"...especially if it hasn't been adjusted since you put the XO's (with new cables presumably) on there this past fall.

Where does the ghost shift occur? When climbing, smooths, etc? Does it skip down to a lower cog, or up to a higher cog? Does it act like it's going to jump a little before it does, then if finally gives up the ghost (sorry, couldn't resist)? Does it tend to occur on the lower, middle, or top part of the cogset? Does it occur more when you're in the small, middle, or large chainring up front??

Answering all of these, we might be able to disagnos how you need to adjust your derailer. But 99.9999% probability your cable has just stretched a little and settled in, just needs a 1/2 turn tightening on the derailer, and all ills will be forgiven.

I haven't taken a stick in the rear derailluer that I can recall and the hanger looks ok.

The ghost shifts occurer on flat level riding and on climbs. It tends to shift up and it is pretty much confined to the small-middle cogs.

I haven't had the bike into the shop for a tune up nor adjustment since Sept when the shop wrench put the XO shifters on.

My guess is that you are spot on with the 'tightening of the rear derailluer. I'll give that a shot.

Thx!

 

[29inch]

I haven't taken a stick in the rear derailluer that I can recall and the hanger looks ok.

The ghost shifts occurer on flat level riding and on climbs. It tends to shift up and it is pretty much confined to the small-middle cogs.

I haven't had the bike into the shop for a tune up nor adjustment since Sept when the shop wrench put the XO shifters on.

My guess is that you are spot on with the 'tightening of the rear derailluer. I'll give that a shot.

Thx!

Yep, no question about it, just a minor adjustment needed.

The titus derailer hangers themselves are peices of art...CNC machined glowing peices of bling glory...they don't take to bending or breaking unless they take a serious hit, you would remember it if you had been down that hard.

It's near miraculous to go that long with nary an adjustment...should be pretty easy to sniff out the adjusting issue - espeicially easy if you have a good bike stand...otherwise it should be simple enough that any shop worth it's salt probably won't even charge you for a quick fix.

 

[SS4life]

Occationally my Sram XO rear D likes to shift itself from gear to gear on its own.

What can I do about this to stop it? I can reduce the frequency of occurance by dittling the adjustment knob on my XO shifters but it doesn't completly stop the problem.

Any insight would be appreciated!

Thx!

deraileurs are failures!!!

 

[Fledermaus]

My XO rear DR was ghost shifting after about 2 months of riding. A little twiddle of the adjustment knob and no more ghosting. As I recall it adjusts counter to my old XT RD.